Nice, wait till you get a hold of a 'discarded' chimney. After 4 shots in the same area an AK-47 from about 40 yards was shooting all the way through and out the other side. Can't wait to see your next video.
How about showing some other calibers for comparison's sake? 308, 30-06, 7mm MAG maybe. And, ONE hollow core concrete block isn't really very strong.........how about stacking up several of the 4" thick solid ones?